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https://issues.apache.org/jira/browse/SPARK-60112?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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L. C. Hsieh reassigned SPARK-60112:
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Assignee: L. C. Hsieh
> Use identity equality for memory consumers
> ------------------------------------------
>
> Key: SPARK-60112
> URL: https://issues.apache.org/jira/browse/SPARK-60112
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Affects Versions: 4.4.0
> Reporter: L. C. Hsieh
> Assignee: L. C. Hsieh
> Priority: Major
> Labels: pull-request-available
>
> TaskMemoryManager keeps spillable consumers in a value-equality
> HashSet<MemoryConsumer>. A consumer whose equals is value-based (e.g. a Scala
> case class) is deduplicated against an equal but distinct consumer: the
> second instance is never offered for spilling and its memory is missing from
> the per-consumer memory breakdown on OOM. SPARK-60071 fixed this for
> HybridRowQueue. Tracking consumers in an identity-based set (e.g.
> Collections.newSetFromMap(new IdentityHashMap<>())) would protect every
> consumer in one place.
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